I’ll go aginst the crowd here and suggest that it might be a pile of cat litter. The clumpimg kind. The colour, size and texture all match what clumping cat litter looks like when its been dumped outside and exposed to rain.

FYI: I have 4 cats and a several hundred moles on my property.

I think Paul is Correct . Cat litter.
Trivia for the day Moles hair grows straight out from the body so they can back up in their tunnel . If it was slanted back like most animals then it would jam up and they could not back up .In my area the moles we have are have a star on their nose hence name star moles Roy Cooke
Healthy ground grows lots of Worms…Worms bring Moles . No worms no moles incidental Voles are a different animal many people call voles Field Mice but not the same